Most likely you will need to install WebGL which took me a few minutes to figure out what it is and where to find it. Eventually got it running on my Mac's Safari and Chrome. Nightly builds can be found here

Once up and running you will find a library of 2D and 3D sample shaders.. Some well known fractals and demo-scene implementations. Great place to play around and learn about shaders or math.

I've spend (or wasted) half a decade on projects involving some sort of furry/feathered creatures. Happy Feet, Where The Wild Things Are, Legend of the Guardians and Happy Feet 2. So, fur shading is going to be my first subject. I will start with a simple Kajiya Kay implementation in 3Delight. Safe to say that majority of hair shaders are using this model. From real-time hair shaders on GPUs to every project I've worked on. It's fast and relatively easy to understand.